Mix the All Purpose flour and cornstarch and set aside. In a food processor mix remaining ingredients for the dough until fluffy. Mix with the flour mixture until dough is thoroughly mixed. On a greased 9” pan, spread the dough and place in the refrigerator for 30 minutes. Preheat a 300°F oven and bake for about 35 to 45 minutes, set aside and completely cool.For Glaze:Mix all ingredients in a food processor and pulse until evenly combined. Spread mixture over cooked dough, and let cool. Once cooled, slice into bars.